JP2010178167A - Portable radio apparatus, and flexible cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable radio apparatus and a flexible cable that keep antenna performance excellent. <P>SOLUTION: The portable radio apparatus includes a first circuit portion to which an antenna 14 is connected and a second circuit portion connected to the first circuit portion through the flexible cable 13. Further, a slit is made in the flexible cable 13. Further, the slit is formed preferably so as to vary the electrostatic coupling amount between the flexible cable 13 and antenna 14. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a portable wireless device and a flexible cable including, for example, a first circuit unit to which an antenna is connected and a second circuit unit connected to the first circuit unit via a flexible cable.

  2. Description of the Related Art In recent years, a mobile radio apparatus such as a mobile phone has a plurality of circuit boards built therein, and the positions of these circuit boards change relatively due to an open / close structure, a slide structure, and the like. For this reason, each circuit board is mutually connected by a flexible cable or the like. For example, a portable terminal is known that electrically connects circuit boards accommodated in first and second housings by a flexible cable that passes through a hinge (see Patent Document 1).

JP 2005-57259 A

  In the mobile terminal shown in Patent Document 1, for example, a problem arises in that a flexible cable that connects two circuit boards to each other and an antenna that transmits and receives radio waves are electrically coupled to each other, thereby adversely affecting the antenna performance. ing. In addition, although the slit is formed in the flexible cable of the said portable terminal, this slit aims at avoiding stress concentration to a flexible cable, and does not aim at avoiding the bad influence of the said antenna performance. .

  The present invention has been made to solve such problems, and a main object of the present invention is to provide a portable wireless device and a flexible cable that can maintain good antenna performance.

One aspect of the present invention for achieving the above object is a portable radio apparatus comprising: a first circuit portion connected to an antenna; and a second circuit portion connected to the first circuit portion via a flexible cable. In the portable wireless device, a slit is formed in the flexible cable.
On the other hand, one embodiment of the present invention for achieving the above object is a flexible cable for mutually connecting a plurality of circuit units built in a wireless device, wherein the flexible cable is slit-formed. A flexible cable may be used.

  ADVANTAGE OF THE INVENTION According to this invention, the portable radio | wireless apparatus and flexible cable which can maintain antenna performance favorably can be provided.

It is a functional block diagram of the portable radio | wireless apparatus which concerns on one Embodiment of this invention. It is a figure which shows an example of the impedance characteristic in the antenna of the portable radio | wireless apparatus which concerns on one Embodiment of this invention. 1 is a perspective view showing an outline of a portable wireless device according to an embodiment of the present invention. It is a side view which shows schematic arrangement | positioning with the 1st and 2nd circuit board and flexible cable of the portable radio | wireless apparatus which concerns on one Embodiment of this invention. It is a top view which shows roughly the flexible cable of the portable radio | wireless apparatus which concerns on one Embodiment of this invention. It is a top view which shows schematically the flexible cable of the portable radio | wireless apparatus which concerns on the past. It is a figure which shows an example of the impedance characteristic in the antenna of the portable radio | wireless apparatus which concerns on the former.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a functional block diagram of a portable radio apparatus according to an embodiment of the present invention. The portable wireless device 10 according to the present embodiment includes a first circuit unit 21 to which an antenna 14 is connected, and a second circuit unit 22 connected to the first circuit unit 21 via a flexible cable 13. . The flexible cable 13 has a slit 13c.

  As described above, by forming the slit 13c in the flexible cable 13, the amount of electrical coupling between the antenna 14 and the flexible cable 13 that connects the first and second circuit portions 21 and 22 to each other is changed. As shown in FIG. 2, unnecessary resonance can be moved out of a desired band. Therefore, since the impedance characteristic of the antenna 14 can be maintained satisfactorily, the antenna characteristic of the portable radio apparatus 10 can be maintained satisfactorily. FIG. 2 is a diagram illustrating an example of impedance characteristics of the antenna of the portable wireless device according to the present embodiment.

  FIG. 3 is a perspective view showing an outline of the portable radio apparatus according to the embodiment of the present invention. The mobile radio apparatus 10 according to the present embodiment is a slide type mobile terminal that includes, for example, a lower housing part 1 and an upper housing part 2 slidably connected to the lower housing part 1.

  In addition, the lower housing portion 1 is attached via a slide structure so that the upper housing portion 2 can slide in the X1 and X2 directions. The upper housing 2 is provided with, for example, a display 3 such as a liquid crystal display or an organic EL display, a speaker 4 and a camera 5. The lower casing unit 1 has operation keys such as a numeric keypad, a determination key, and a function key, and is provided with an operation unit 6 for operating the portable wireless device 10, a microphone 7, a power source (battery), and the like. ing. Note that the mobile wireless device 10 according to the present embodiment has, for example, well-known functions of a mobile terminal such as a general mobile phone, and therefore a detailed description of these functions is omitted.

  FIG. 4 is a side view showing a schematic arrangement of the first and second circuit boards and the flexible cable of the portable wireless device according to the embodiment of the present invention. The lower casing unit 1 stores a first circuit board 11 for controlling the operation unit 6, and the upper casing unit 2 stores a second circuit board 12 for controlling the display unit 3. ing. The first and second circuit boards 11 and 12 include, for example, a CPU (Central Processing Unit) that performs control processing, arithmetic processing, and the like, a ROM (Read Only) that stores a control program executed by the CPU, an arithmetic program, and the like. Memory), and a microcomputer composed of a RAM or the like that temporarily stores processing data and the like.

  The first circuit board 11 and the second circuit board 12 are electrically connected to each other via the flexible cable 13. Connector portions 13a are provided at both ends of the flexible cable 13 (FIG. 5). The flexible cable 13 is connected to the first and second circuit boards 11 and 12 via the connector portion 13a.

  An antenna 14 for transmitting and receiving radio waves to and from other communication devices is connected to the first circuit board 11 via a communication network or the like. For example, the antenna 14 is built in the lower housing 1, but is not limited thereto, and may be attached to, for example, the upper surface of the lower housing 1, and any configuration is applicable. As the antenna 14, for example, a linear antenna such as a dipole antenna is used.

  The flexible cable 13 includes a flexible film member 13b and a plurality of linear wiring conductors (copper foil or the like) embedded along the longitudinal direction of the film member 13b. In addition, the film part 13b is formed with insulating synthetic resins, such as a polyimide, for example. In addition, the plurality of wiring conductors are configured by power supply lines, signal lines, and the like. The first and second circuit boards 11 and 12 can perform bidirectional transmission and reception of electric signals via, for example, signal lines of wiring conductors of the flexible cable 13. Moreover, the power supply of the lower housing | casing part 1 can supply electric power with respect to the 2nd circuit board 12 of the upper housing | casing part 2 via the power line of the wiring conductor of the flexible cable 13, for example.

  Further, the upper housing part 2 slides in the X1 direction with respect to the lower housing part 1, and the second circuit board 12 also slides in the X1 direction with respect to the first circuit board 11 (FIG. 3). In response to this slide, the flexible cable 13 is folded, for example (FIG. 4). Similarly, the upper housing part 2 slides in the X2 direction with respect to the lower housing part 1, and the second circuit board 12 slides in the X2 direction with respect to the first circuit board 11 (stored state). In response to this slide, the flexible cable 13 is in a state of being unfolded from, for example, the folded state.

  By the way, in the conventional portable radio apparatus, for example, a flexible cable (FIG. 6) for connecting two circuit boards to each other and an antenna are electrically coupled to each other within a desired band as shown in FIG. Unnecessary resonance may occur. As a result, the impedance characteristics of the antenna deteriorate and the radiation efficiency of the antenna deteriorates, resulting in a problem that the antenna performance deteriorates. FIG. 7 is a diagram illustrating an example of impedance characteristics in an antenna of a conventional portable wireless device.

  Therefore, the flexible cable 13 of the mobile wireless device 10 according to the present embodiment is formed with a substantially rectangular slit 13c in the substantially central portion along the longitudinal direction thereof over substantially the entire length (FIG. 5). As a result, the amount of electrical coupling between the flexible cable 13 that connects the first and second circuit boards 11 and 12 and the antenna 14 is changed, and unnecessary resonance is moved out of the desired band as shown in FIG. Can be moved. Therefore, since the impedance characteristic of the antenna 14 can be maintained satisfactorily, the antenna characteristic of the portable radio apparatus 10 can be maintained satisfactorily.

  Furthermore, as shown in FIG. 4, when the upper casing portion 2 slides in the X1 direction with respect to the lower casing portion 1 and the flexible cable 13 in the folded state and the antenna 14 are closer, the flexible cable 13 And the amount of electrical coupling between the antenna 14 and the antenna 14 are increased. Therefore, as in this embodiment, the slit 13c is formed in the flexible cable 13, and the amount of electrical coupling between the flexible cable 13 and the antenna 14 is changed so that unnecessary resonance is moved outside the desired band. The effect of improving the antenna performance becomes larger.

  As an example, the flexible cable 13 has a substantially rectangular slit 13c formed in a substantially central portion along the longitudinal direction thereof. However, the shape is not limited to this, and the number, And the position may be arbitrary. That is, the number, shape, and / or position of the slits 13c of the flexible cable 13 are changed so that the amount of electrical coupling between the flexible cable 13 and the antenna 14 is changed and unnecessary resonance is moved outside the desired band. To do.

  More specifically, one slit 13c is formed in the flexible cable 13. However, the present invention is not limited to this. For example, two or three slits may be formed in parallel to the longitudinal direction. Further, the length in the vertical direction (longitudinal direction) and / or the length in the horizontal direction (width direction) of the slit 13c may be arbitrarily changed. Furthermore, although the substantially rectangular slit 13c is formed, it is not limited thereto, and for example, a trapezoidal or elliptical slit may be formed. Furthermore, although the slit 13c is formed in the substantially center part of the flexible cable 13, it is not restricted to this, For example, the slit may be formed from the edge.

  As described above, the flexible cable 13 of the portable wireless device 10 according to the present embodiment is formed with the slit 13c so as to move unnecessary resonance out of the desired band. Thereby, the amount of electrical coupling between the flexible cable 13 that connects the first and second circuit boards 11 and 12 and the antenna 14 can be changed, and unnecessary resonance can be moved out of the desired band. Therefore, since the impedance characteristic of the antenna 14 can be maintained satisfactorily, the antenna characteristic of the portable wireless device 10 can be maintained satisfactorily.

  Although the best mode for carrying out the present invention has been described using the above-described one embodiment, the present invention is not limited to such one embodiment and is within the scope not departing from the gist of the present invention. Various modifications and substitutions can be added to the above-described embodiment.

  For example, in the above-described embodiment, a linear antenna is applied to the antenna 14. However, the present invention is not limited to this. For example, a planar (plate-shaped) antenna, a three-dimensional antenna, a meander antenna, or the like may be applied. Good.

  Moreover, in the said one Embodiment, although the upper housing | casing part 2 is applied to the slide-type portable radio | wireless apparatus 10 which slides with respect to the lower housing | casing part 1, it is not restricted to this, For example, an upper housing part is a lower side. The present invention can also be applied to a folding portable wireless device that is folded via a hinge with respect to the casing.

  Furthermore, in the above-described embodiment, the present invention is applied to a mobile phone. However, the present invention is not limited to this.

  Furthermore, in the above-described embodiment, the slit 13c is formed in the flexible cable 13 that electrically connects the first circuit board 11 of the operation unit 6 and the second circuit board 12 of the display unit 3. However, the slit may be formed in the flexible cable that connects any two circuit boards to each other.

  Furthermore, in the above-described embodiment, the slit 13c is formed in one flexible cable 13. However, the present invention is not limited to this. For example, the slit may be formed in a plurality of flexible cables. .

  Furthermore, in the one embodiment, the antenna 14 is connected to the first circuit board 11. However, the present invention is not limited to this, and may be connected to the second circuit board 12, for example.

DESCRIPTION OF SYMBOLS 1 Lower housing | casing part 2 Upper housing | casing part 3 Display part 4 Speaker 5 Camera 6 Operation part 7 Microphone 10 Portable radio | wireless apparatus 11 1st circuit board 12 2nd circuit board 13 Flexible cable 13a Connector part 13b Film member 13c Slit 14 Antenna

Claims (9)

A first circuit portion to which an antenna is connected;
A portable wireless device comprising: a second circuit unit connected to the first circuit unit via a flexible cable;
A portable wireless device, wherein a slit is formed in the flexible cable. The portable wireless device according to claim 1,
The portable wireless device, wherein the slit is formed so as to change an electrical coupling amount between the flexible cable and the antenna. The portable wireless device according to claim 1 or 2,
The portable wireless device, wherein the slit is formed in a substantially rectangular shape along a longitudinal direction of the flexible cable. The portable wireless device according to any one of claims 1 to 3,
The portable wireless device, wherein the first circuit unit includes a first circuit board for operation, and the second circuit unit includes a second circuit board for screen display. The portable wireless device according to any one of claims 1 to 4,
A lower housing portion for housing the first circuit portion;
A portable wireless device further comprising: an upper housing portion that houses the second circuit portion and is slidably attached to the lower housing portion. A portable wireless device according to any one of claims 1 to 5,
The portable wireless device, wherein the antenna is a linear antenna, a planar antenna, a three-dimensional antenna, or a meander antenna. A flexible cable for mutually connecting a plurality of circuit units built in a wireless device,
A flexible cable characterized in that a slit is formed in the flexible cable. The flexible cable according to claim 7,
The slit is formed so as to change an electrical coupling amount between the flexible cable and an antenna connected to the circuit unit. The flexible cable according to claim 7 or 8,
The said slit is formed in the substantially rectangular shape along the longitudinal direction of the said flexible cable, The flexible cable characterized by the above-mentioned.

Images